Excellent point and we experience similar long haul highway driving from Central North Carolina out west to the Rockies. The Ineos Grenadier is pretty expensive not to have Adaptive Cruise Control as an option.
As mentioned the traction control is not fully baked, stock turning circle is terrible, has tons of electronic nags (remind y'all of anything?), interior wheel well trims are slanted inboard instead of flat (sucks for storage), Direct Injected Turbo I6 (at least iForce Max also is Port Injected as well as DI), Made in France (no comment).
Grenadiers look cool almost a synthesis of 70-series, G-Wagon, and OG Defender 110, but kinda lame. Land Rover is actually building (uber expensive) Defender classics again with modern powertrains and interiors. When I looked hard at the Grenadier, I stopped short of test driving and test drove a G550 instead. Grenadier does NOT get you: V8, gauge cluster for driver, diesel option, manual option, high duty cycle engine with wide parts availability, rear center armrest so why is it so awesome other than it looks like an old Defender and is built a bit better (no super hard to do)?
I would go 2013-2015 G550 all day before even a used Grenadier.